[sane-devel] Bleedthrough (was brightness/contrast/gamma LUT ideas?)

m. allan noah anoah at pfeiffer.edu
Tue Jul 11 13:58:34 UTC 2006

On Tue, 11 Jul 2006, Jim McQuillan wrote:

>>> i've found that documents printed on 20lb paper are getting some
>>> "bleed through". That is, the scan of the front is actually showing
>>> some of the stuff that is on the back of the page.
>>> I'm thinking that if I could reduce the brightness of the light, it
>>> may not bleed through so badly.
>> Maybe, but I think you will get better results by using a black
>> backing. It's a puzzle to me why so many scanners use white backing.
> Sorry, but I don't understand what you mean by 'black backing'. Could you 
> please explain?

background color, behind the page. some flatbeds have a black sheet you 
can put in the lid, your very expensive fujitsu adf has a servo operated 
shutter or mirror that moves in response to a scsi command. this is 
supported in the most recent cvs versions of the backend.


"so don't tell us it can't be done, putting down what you don't know.
money isn't our god, integrity will free our souls" - Max Cavalera

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